Review

Exactly how can a liquid being simulate a gas, or a fire? It makes even less sense than the changing mass/size problem. And it's very disturbing for Starfleet, I would think. Think about how hard it would be to search for Changeling infiltrators on a planet when they could be any passing cloud. Watch the skies!

Plotline

When Odo meets another of the Changelings that the Founders sent out into the galaxy, he brings it to Deep Space Nine and tries to strike up a friendship. But the Shapeshifter, known as Laas, is no fan of Solids, and when his presence on the station generates considerable friction, Odo must once again choose between us and his own kind.